/Engine/Source/Runtime/Engine/Classes/Engine/PackageMapClient.h
Slimmed down version of SerializeObject, that writes an object reference given a NetGUID and name (e.g, it does not require the actor to actually exist anymore to serialize the reference). This must be kept in sync withUPackageMapClient::SerializeObject.
virtual bool WriteObject ( [FArchive](API\Runtime\Core\Serialization\FArchive) & Ar, [UObject](API\Runtime\CoreUObject\UObject\UObject) * InOuter, [FNetworkGUID](API\Runtime\Core\Misc\FNetworkGUID) NetGUID, [FString](API\Runtime\Core\Containers\FString) ObjName )